Bone set



Feb. 21, 1928:.

' L. w. H. SCHIMPFF BONE SET 2 Sheets-Sheet 1 Filed June 26. 1926 fill 118 2 Sheets-Sheet a L. W. H. SCHIMPFF BONE SET Filed June 26. 1926 Feb. 21, 1928.

Patented Feb. 21, 1928.

iusrrsn mess r ATENT o-FFicE.

LOUIS w; H. scnnvrrrn, or 'iiinenrinnn, new JERSEY, ssrsnon Towns: KNY-Y sonnnnnn' oonronmrron or AMERICA, or n wYoRK, N. Y., A CORPORATION" OF NEW YORK.

. Applicaticnfiled lune 26,

inventionv relates to an improvement in a bone set andthe novelty consists in the adaptation and arrangement'of parts as will be more fully hereinafter pointed out. p, v

In performing operations where the pa= tients bone is to be cut it is often necessary: to first cut a piece of the patients own. bone from theqshinf and then proceed with the bonerepairing as a piece of the patients 10 Own bone is required for such operations. This necessarily entails along operation and theretore the cutting device used must be simple andefiectiveand. it-Inust be possible to make quickv changes of the tools being usedand-the instrument mustlockinto positive position to prevent any slipping or loosening which might prove'most harmful. My device is adapted to fulfill these re: quirementsiand furnishesa set which has. a shell which can be readilyremoved; for sterilization and has an observation; opening to insure perfect electricaltcontact and a handle which is adjustable foreither a rightehand ora left-handoperator. Furthermore; it hasmeans for quickly detaching the tool in use and attaching another with a positive lock and an adjustment wherebytwinsaws may be quickly changed as'to their width t adjustment apart without taking them apart. Furthermore, the drive is m ore di.- rect than invany prior device thereby insuring more power application in theuse of the same motor. 3 1

Referring to the drawings Figure ,1 is a front elevation of my complete device; Fig? ure 2 is a detail of the upper portion of the outer shell member; Figure 3 isa detail of the lower port" on of the innershell member; Figure at is a detail-of the twin saws; Figure 5-is an elevation of the upper'portion of the bone set, portions beingshown in section so as to show the inside connections; Figurefi is a portion of the lower part of the bone set, parts being cut away so as to show the interior parts andconneetions, V I

In the drawings is the inner shellmerne her. having external lugs 11 and az-hole 12., out shell mem e ha ng a spring i5 and spring 14 normally 4O in'mesh with gear .38 and rotati Bone 1925. Serial at. 118,732,

tends to bend toward shell l3, and said. shell 13 has three bayonet locking? members 16 adapted to engage the lugs. 11. otthe fi nne z he ember Lug l rigiclly, se ct e-v he u de sidef vthev sp ng Pas es through a hole 18in the outer shell member, 13 and is adapted to engage hole 12. in the inner shell member 10. A limiting member 19 is rigidly secured to theoutershell l3fand= has an-outer endQO turned at'right. anglesgto the main body of the limiting'member 19' whereby it engages an outer hooked member 21v of the spring 14 thereby limiting theout ward movement ofsaidspring, v

:Power wire connections 22 are connected to a source of power not shown] and pass through a. connecting element 23 having,- re: enforcing element 24: thereover a-tfthe point where, it passes through-the inner shellmember 10. The electricalplug connectionsare of the usual. type but an. observation hole 25 is cut in the inner: shellflm ember 10 so-asito permit the operator to, see it the bayonet 1001926 is properly engaged. to insure per feet electrical connection; 27 is the? usual type of motor used in thesedevices, The outer shell member 13 has an exten:

.sion shell member 28- adapted to belocked to the shellmember 13 by neans of the usual nut 29 and motor shaft 30. is thereby prof tected in: sai d extension shell member 28. In the Figures 1 and GisshoWn a driving or saw shaft housing 31 in which is mounted a. shaft 32 having a lug 33 adaptedto loc-k s intabayonet lock 3 L whereby the'upper end of the shaft 32-is locked into the shaft 30, e SaidshaftBZ isznormally driven by said motor 27' in a clockwise direction, A set. screw 35 mounted in the. thread: 36 of the housing 3l isadapfed tozlock said housings31 rigid-1y in positi n af r. the 111g 33 s een locked into the bayonet lock 34; thereby Securing the hous ng 31 se ur y in p iti n against the extensionshell 28. Shaft 32 is mountedcoll ball bearings 37 and has a worm gear 38mg: ysecu ecl o ts lower en second and driven worm gear 39 is mounted on a'shaft' eo l e f using 31.

el-iihlrwise in the lower end cit l loosen and and a saw shaft 41 having a flattened portion 42 adapted to engage a flattened portion of shaft 40 has mounted thereon a rotary saw plate 43 secured in the usual manner by means of nut 44 over the threaded portion 45 of the'shaft 41 and a housing 46 is mounted on said shaft 41 having a threaded portion 47 on which is mounted a nut 48 whereby a second rotary saw 49 is secured in position and in the other end of said housing 46 is a closing member 50 having a threaded portion 51 adapted to be engaged by the housing member 46. A spring 52 is mounted on the shaft 41 so as to fitthe same snugly and one end of this spring 52 is run through an opening in the closing member 50 where by this end of the spring is held and turns with the housing 46.

i As the spring 52 is mounted on the shaft 41 itwill bind and lock against possible rotation of the housing 46 and the saw 49 carried thereby in the direction counter. to the direction of the rotation of the saw 49 through frictional contact but will readily ermit the housing 46 and the saw 49 'to' e turned thereby moving the housing 46 and the saw 49 on the shaft 41 in the direction of the rotation of the .saw. This permits the operator to readily effect a quick adjustment of the space between the saws 49 and 43 without any danger of loosening themembers or taking them apart as the spring 52, housing46 and saw 49 carried thereby are positively locked in position against rotation counter to the direction of the rotation of the saw, and it is to be noted that the saw 49 travels with the shaft 41 in a counter-clockwise direction.

Near the upper end ,of the housing 31 is a projection 54 in which is threaded a thumb screw 55 and a bracket 56 is adapted to be secured at one end over the shaft 41 and at the other end over the thumb screw 55 Whereby the turning down of thumb screw 55 will lock said bracket 56 rigidly in position so that it may act as an outer hearing at this lower end for the shaft 41.

Theextension shell member 28 has a pair of ridges of usual construction in its upper end adapted to be engaged by slots in a ring 57 of a handle 58 whereby in conjunction with a set screw 59 said handle may be rigidly locked in position as shown in Fig: ure 1 or by loosening the set screw 59 by sliding the ring 57 off of said ridges which are not shown herein being of usual construction the handle may be swung around tothe other side and be placed in position on these said ridges and the set screw 59 again tightened therebylocking the said handle into position for a left handed operator.

I claim: 1. In a bone set the combination of an electric motor having a shaft driven thereby, a separable shell for said motor and shaft,

a handle adjustable forright and left hand operators, a housed shaft engageable with said motor shaft, said housing engaging said motor shaft shell, a driving gear on the 1 outer end of said housed shaft, a' driven gear meshing with said driving gear and two rotary saws mounted on a driven pinion engaging said shafts outside ofsaid housing and means for manually adjusting the space between said saws comprising one fixed saw and one mounted on a housing having a spring secured at one end to said housingand passing around said pinion so as to permit said spring housing and saw to be'turned in the direction of rotation of the pinion.

2. In a bone set the combination of an electric motor havinga shaft driven thereby, a separable shell encasing said motor, means for readily separating said shell, a handle" housing and passing around said pinion so' as to permit said spring housing and saw to be turned'in the pinion.

3. In abone'set the combination of an electric motor having ashaft driven thereby,

a separable shell encasing said motor,-means no for readily separating said shell, a handle for said set, a housed shaft, means for securing said housing to said shell,; a saw mounted on said housing, means for-driving said saw comprising a gear at the outer end of said housing shaft, a pinion gear meshing therewith, a pair of saws mounted on the outer end of the pinionof said pinion gear outside ofsaid housing and means for manually adjusting the space between said saws comprlsing one fixed saw and one mounted on a housing'ha'ving a spring secured at one end to said housing and passing around said pinion so as to permit said spring housing and saw to be turned in. the direction of rotation of the pinion; V V

4. In a bone set the combination of an electric motor having a shaft driventhereby} a separable shell encasing said motor, means for readily separating said shell, a handlev for said set, a housed shaft, means for securing-said housed shaft to said motor shaft,

means for securing said housing to said shell,- a pair of saws mounted on said housing and 1 means for manually ad ustingthespace be} tween said saws comprlsing one fixed saw direction of rotation'of-the and one mounted on a springhousing hav- I ing a spring secured at one end to said housing and passing around said pinion so as to permit said spring housingand saw to be turned in the direction of rotation of the pinion, said saw pinion being readily separable from said driven pinion.

5. In a bone set a pair of saws and means for adjusting the space between 'thesame 5 comprising a pinion one fixed saw mounted thereon and one mounted thereon on a spring houslng havlng a spring secured at LOUIS W. 1-1. SOHIMPFF. 

